CN102738819A - Power transmission system for improving transmission capability of alternating-current circuit through using mixed current converting technology - Google Patents
Power transmission system for improving transmission capability of alternating-current circuit through using mixed current converting technology Download PDFInfo
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Abstract
The invention relates to the field of a power electronic technology and particularly relates to a power transmission system for improving the transmission capability of an alternating-current circuit through using a mixed current converting technology. The power transmission system adopts a tri-polar wiring manner; each-polar wiring comprises a lead wire and converters respectively connected with both ends of the lead wire; and each converter comprises a voltage source converter and a current source converter. The invention designs the mixed power transmission system with sensitivity and economical efficiency by combining the advantages of strong controllability of a voltage source converter, high capacity of the current source converter and low cost. According to the power transmission system provided by the invention, the problems of lead wire use ratio, passive compensation and the like caused by that the alternating-current circuit is improved to a direct-current circuit, can be well solved by using bidirectional conduction capability of the voltage source converter and a bidirectional transistor converter, and matching with a switch converting device, so that the power transmission system has important meanings on overcoming the paradox that the load of large-size cities is continuously increased and the difficulty of newly building circuits is increased.
Description
Technical field
The present invention relates to electric and electronic technical field, be specifically related to a kind of the employing and mix the transmission system that commutation technique improves the alternating current circuit transmittability.
Background technology
Newly-increased transmission of electricity corridor faces increasing economy and environmental protection restriction, and especially the large size city central area increases traditional overhead transmission line and do not meet the urban planning requirement, and newly-increased simultaneously underground cable also receives restriction in many ways.Transform the alternating current circuit as DC operation and not only can eliminate the restriction of AC system, and transmission line capability also will increase power flow.In the face of newly-increased transmission of electricity corridor more and more difficult, the growing contradiction of load level, will have the alternating current circuit now and convert DC operation into, when removing newly-built transmission of electricity corridor from, promote the power delivery ability, for the problems referred to above provide cost-effective solution.
Obtaining the consistent of domestic and international research institution in recent years to the research of alternating current circuit direct current conversion pays close attention to.To how making full use of the problem of ability to transmit electricity that number is the three-phase AC line of odd number, there is document to propose several kinds of solutions.Barthold proposes a kind of scheme that three-phase AC line is transform as three utmost point direct current transportation; Adopt bidirectional thyristor to realize the electric current two-way admittance through the utmost point 3; The electric current of periodically sharing other the two poles of the earth is with the maximization ability to transmit electricity, but the same inevitable a large amount of reactive-load compensation equipments that need to be equipped with conventional high-tension direct current transportation HVDC.ABB AB proposes a kind of scheme that three-phase AC line is transform as flexible DC power transmission; Adopt an extra phase leg that the 3rd polar conductor periodically is connected to first polar conductor or second polar conductor; Thereby utilize the 3rd polar conductor conduction current, but can not realize the uniform distribution of line loss between three leads.Along with the increase of load, this scheme the 1st utmost point and the 2nd polar conductor at first reach the thermally-stabilised limit, can't make full use of the thermally-stabilised limit of the 3rd polar conductor.
If be purpose with the transmission of electricity merely; Conventional high-tension direct current transportation HVDC is big with its transmission line capability, technology maturation and by wide-scale adoption; But because thyristor is a half control type device; Need a large amount of reactive power compensation and filter, have inherent limitation when causing high voltage direct current transmission HVDC technology to be used for system interconnect.Voltage source converter controllability based on full-control type devices such as IGBT is stronger; Can realize meritorious and idle control independently fast; And can be used for after passive network power supply, accident, restoring electricity fast and deceive occasion such as startup, but capacity is less relatively, and the converter cost is higher.Therefore being necessary to seek takes into account economical and novel alternating current circuit direct current conversion plan flexibility.
Summary of the invention
Deficiency to prior art; The present invention provides a kind of the employing to mix the transmission system that commutation technique improves the alternating current circuit transmittability; Advantage in conjunction with voltage-source type converter controllability is strong and current source type converter capacity is big, cost is low designs a kind of mixed type transmission system of taking into account flexibility and economy.This kind transmission system is utilized voltage source converter and bidirectional thyristor converter electric current two-way admittance ability; Cooperate the switch switching device shifter; Well solved problems such as conductor efficiency that the alternating current circuit is transformed into DC line and reactive power compensation, significant for solving the difficult day by day contradiction of growing and the newly-built circuit of large size city load.
The objective of the invention is to adopt following technical proposals to realize:
Adopt and mix the transmission system that commutation technique improves the alternating current circuit transmittability, its improvements are that said transmission system adopts three utmost point connection types, and every utmost point wiring comprises the converter that lead and lead two ends connect respectively; Said converter comprises voltage source converter and current source converter (csc).
Preferably, said three leads adopt three-phase alternating current overhead transmission line or cable, corresponding to the 1st polar conductor, the 2nd polar conductor and the 3rd polar conductor of said transmission system.
Preferably, said transmission system comprises following two kinds of organization plans:
A kind of organization plan is following: wherein a utmost point wiring comprises the 1st polar conductor and current source converter (csc); Another utmost point wiring comprises the 2nd polar conductor and current source converter (csc); The 3rd utmost point wiring comprises the 3rd polar conductor, switch switching device shifter and voltage source converter;
Another kind of organization plan is following: wherein a utmost point wiring comprises the 1st polar conductor and voltage source converter; Another utmost point wiring comprises the 2nd polar conductor and voltage source converter; The 3rd utmost point wiring comprises the 3rd polar conductor and current source converter (csc).
More preferably, in said a kind of organization plan, a said utmost point wiring comprises the 1st polar conductor and current source converter (csc); Said the 1st polar conductor two ends are symmetrically arranged with current source converter (csc);
Another utmost point wiring comprises the 2nd polar conductor and current source converter (csc); Said the 2nd polar conductor two ends are symmetrically arranged with current source converter (csc); Said current source converter (csc) adopts unidirectional thyristor;
The 3rd utmost point wiring comprises the 3rd polar conductor, switch switching device shifter and voltage source converter; Said the 3rd polar conductor two ends are symmetrically arranged with switch switching device shifter and voltage source converter;
Said the 3rd polar conductor two ends are connected with the direct current clamp capacitor of voltage source converter is anodal respectively through the switch switching device shifter; Said direct current clamp capacitor minus earth; Or
Said the 3rd polar conductor two ends are connected with the direct current clamp capacitor negative pole of voltage source converter through the switch switching device shifter respectively; Said direct current clamp capacitor plus earth.
More preferably, said the 1st polar conductor and the symmetrically arranged current source converter (csc) in the 1st polar conductor two ends and the symmetrically arranged current source converter (csc) of the 2nd polar conductor and the 2nd polar conductor two ends constitute bipolar high voltage direct current transmission connection type; Said the 1st polar conductor, the 2nd polar conductor and the common ground point of the 3rd polar conductor are connected.
More preferably, said switch switching device shifter is used to realize the counter-rotating of the 3rd polar conductor polarity of voltage; It adopts mechanical switch, thyristor switch, based on the combination of switch or the mechanical switch and the thyristor switch of turn-off device.
More preferably, in the said another kind of organization plan, a said utmost point wiring comprises the 1st polar conductor and voltage source converter; Said the 1st polar conductor two ends are symmetrically arranged with voltage source converter; Said the 1st polar conductor two ends are connected with the direct current clamp capacitor of said voltage source converter is anodal respectively; Said direct current clamp capacitor minus earth;
Another utmost point wiring comprises the 2nd polar conductor and voltage source converter; Said the 2nd polar conductor two ends are symmetrically arranged with voltage source converter; Said the 2nd polar conductor two ends are connected with the direct current clamp capacitor negative pole of said voltage source converter respectively; Said direct current clamp capacitor plus earth;
The 3rd utmost point wiring comprises the 3rd polar conductor and current source converter (csc); Said the 3rd polar conductor two ends are symmetrically arranged with current source converter (csc).
More preferably, said current source converter (csc) is two-way antiparallel thyristor; Said the 1st polar conductor, the 2nd polar conductor and the earth point of the 3rd polar conductor are connected.
More preferably, said current source converter (csc) adopts the converter based on thyristor half control type electronic power switch device; Said voltage source converter adopts based on voltage-source type AC-DC that can turn-off power electronic device or DC-AC converter;
Wherein the AC side of the current source converter (csc) of head end and voltage source converter is passed through the same bus of converter transformer or reactor parallel connection incoming transport system respectively, or different bus;
The wherein terminal current source converter (csc) and the AC side of voltage source converter are passed through the same bus of converter transformer or reactor parallel connection incoming transport system respectively, or different bus.
More preferably, the voltage and current constant polarity of said the 1st polar conductor and the 2nd polar conductor, said the 3rd polar conductor is realized the counter-rotating of polarity of voltage.
With the prior art ratio, the beneficial effect that the present invention reaches is:
Employing mixing commutation technique provided by the invention improves the transmission system of alternating current circuit transmittability, can be good at solving three-phase AC line, and especially single time three-phase AC line transform the conductor efficiency problem after the direct current transportation as.Adopt this kind structure can maximize the through-put power of three leads, direct current flows between three leads simultaneously, does not constitute path with the earth.This transmission system structure will combine to adopt thyristor converter device and voltage source converter to be used to reduce the current conversion station cost, to the demand reduction of reactive-load compensation equipment, and possess the ability that provides dynamic reactive to support.The transmission system structure that this kind adopts mixed type AC-DC commutation technique to improve the three-phase AC line transmittability can be applied to occasions such as three-phase alternating current overhead transmission line or the transformation of three-phase alternating current cable transmission system direct current, and economy, flexibility and the reliability of the operation of increase system.
Description of drawings
Fig. 1 is the transmission system structure chart that employing mixing commutation technique provided by the invention improves the alternating current circuit transmittability;
Fig. 2 is transmission system organization plan 1 sketch map that employing mixing commutation technique provided by the invention improves the alternating current circuit transmittability;
Fig. 3 is a switch switching device shifter functional schematic provided by the invention;
Fig. 4 is a kind of embodiment figure of switch switching device shifter provided by the invention;
Fig. 5 is transmission system organization plan 2 sketch mapes that employing mixing commutation technique provided by the invention improves the alternating current circuit transmittability.
Fig. 6 is each polar conductor electric current of transmission system provided by the invention, change in voltage sketch map;
Fig. 7 is each polar conductor variable power sketch map of transmission system provided by the invention.
Embodiment
Do further to specify below in conjunction with the accompanying drawing specific embodiments of the invention.
The present invention adopts the transmission system structure chart that mixes commutation technique raising alternating current circuit transmittability as shown in Figure 1; Fig. 1 is the transmission system structure chart that employing mixing commutation technique provided by the invention improves the alternating current circuit transmittability; Transmission system adopts three utmost point connection types, and every utmost point wiring comprises the converter that lead and lead two ends connect respectively; Converter comprises voltage source converter and current source converter (csc).Three AC-DC or DC-AC converter are respectively adopted in the transmission system two ends, and an end of three converter DC sides connects altogether, and the other end links to each other with three transmission lines respectively.This transmission system makes electric current uniform distribution on three polar conductors through the size or the direction of each utmost point direct current of periodic change, makes the overall utilization rate of lead reach the highest.
Transmission system comprises following two kinds of organization plans:
A kind of organization plan is following: wherein a utmost point wiring comprises the 1st polar conductor and current source converter (csc); Another utmost point wiring comprises the 2nd polar conductor and current source converter (csc); The 3rd utmost point wiring comprises the 3rd polar conductor, switch switching device shifter and voltage source converter;
One utmost point wiring comprises the 1st polar conductor and current source converter (csc); The 1st polar conductor two ends are symmetrically arranged with current source converter (csc);
Another utmost point wiring comprises the 2nd polar conductor and current source converter (csc); The 2nd polar conductor two ends are symmetrically arranged with current source converter (csc); Current source converter (csc) adopts unidirectional thyristor;
The 3rd utmost point wiring comprises the 3rd polar conductor, switch switching device shifter and voltage source converter; The 3rd polar conductor two ends are symmetrically arranged with switch switching device shifter and voltage source converter; The 3rd polar conductor two ends are connected with the direct current clamp capacitor of voltage source converter is anodal respectively through the switch switching device shifter; Direct current clamp capacitor minus earth; Or
The 3rd polar conductor two ends are connected with the direct current clamp capacitor negative pole of voltage source converter through the switch switching device shifter respectively; Direct current clamp capacitor plus earth.
The symmetrically arranged current source converter (csc) of the 1st polar conductor and the symmetrically arranged current source converter (csc) in the 1st polar conductor two ends and the 2nd polar conductor and the 2nd polar conductor two ends constitutes bipolar high voltage direct current transmission connection type; The 1st polar conductor, the 2nd polar conductor and the common ground point of the 3rd polar conductor are connected.The switch switching device shifter is used to realize the counter-rotating of the 3rd polar conductor polarity of voltage; It adopts mechanical switch, thyristor switch, based on the combination of switch or the mechanical switch and the thyristor switch of turn-off device.
Another kind of organization plan is following: wherein a utmost point wiring comprises the 1st polar conductor and voltage source converter; Another utmost point wiring comprises the 2nd polar conductor and voltage source converter; The 3rd utmost point wiring comprises the 3rd polar conductor and current source converter (csc);
One utmost point wiring comprises the 1st polar conductor and voltage source converter; The 1st polar conductor two ends are symmetrically arranged with voltage source converter; The 1st polar conductor two ends are connected with the direct current clamp capacitor of voltage source converter is anodal respectively; Direct current clamp capacitor minus earth;
Another utmost point wiring comprises the 2nd polar conductor and voltage source converter; The 2nd polar conductor two ends are symmetrically arranged with voltage source converter; The 2nd polar conductor two ends are connected with the direct current clamp capacitor negative pole of voltage source converter respectively; Direct current clamp capacitor plus earth;
The 3rd utmost point wiring comprises the 3rd polar conductor and current source converter (csc); The 3rd polar conductor two ends are symmetrically arranged with current source converter (csc).
Current source converter (csc) is two-way antiparallel thyristor; The 1st polar conductor, the 2nd polar conductor and the earth point of the 3rd polar conductor are connected.
Current source converter (csc) adopts the converter based on thyristor half control type electronic power switch device; Voltage source converter adopts based on voltage-source type AC-DC that can turn-off power electronic device or DC-AC converter; Wherein the AC side of the current source converter (csc) of head end and voltage source converter is passed through the same bus of converter transformer or reactor parallel connection incoming transport system respectively, or different bus; The wherein terminal current source converter (csc) and the AC side of voltage source converter are passed through the same bus of converter transformer or reactor parallel connection incoming transport system respectively, or different bus.
The voltage and current constant polarity of the 1st polar conductor and the 2nd polar conductor, said the 3rd polar conductor is realized the counter-rotating of polarity of voltage.
Below in conjunction with specific embodiment the present invention is done further detailed description.
The transmission system organization plan 1 of employing mixing commutation technique raising provided by the invention alternating current circuit transmittability is as shown in Figure 2; This transmission system comprises three transmission pressure L1, L2, L3; Two switch switching device shifters, four current source type converter CSC1, CSC1 ', CSC2, CSC2 ', two voltage source converter VSC3, VSC3 '; The direct current clamp capacitor C3 of voltage source converter, C3 ', and AC system 1, AC system 2.
The two ends of lead L1 and CSC1, the positive pole of CSC1 ' links to each other, the two ends of lead L2 and CSC2, the negative pole of CSC2 ' links to each other, and the two ends of lead L3 connect the switch switching device shifter, and then link to each other with the negative or positive electrode of direct current clamp capacitor C3, C3 '.Common ground point is connected to CSC1, the negative pole of CSC1 ', and CSC2, the positive pole of CSC2 ', and be connected with the negative or positive electrode of direct current clamp capacitor C3, C3 ' through the switch switching device shifter.
Wherein the AC side of the current source converter (csc) CSC1 of head end, CSC2 and voltage source converter VSC3 is passed through the same bus of converter transformer or reactor parallel connection incoming transport system 1 respectively, or different bus;
Wherein the AC side of terminal current source converter (csc) CSC1 ', CSC2 ' and voltage source converter VSC3 ' is passed through the same bus of converter transformer or reactor parallel connection incoming transport system 2 respectively, or different bus.
The switch switching device shifter is positioned at the two ends of the 3rd polar conductor L2, can adopt mechanical switch, the combination of thyristor switch or mechanical switch and thyristor switch.The functional schematic of switch switching device shifter is as shown in Figure 3; Bidirectional switch SW1; SW1 ' can be connected node 1 simultaneously with node 3, node 2 is connected with node 4, realizes that the positive pole of direct current clamp capacitor C3 shown in Figure 1, C3 ' links to each other with lead L3; The minus earth of C3, C3 ', lead L3 polarity of voltage is for just; Or simultaneously node 1 is connected with node 4 ', node 2 is connected with node 3 ', realizes that the negative pole of direct current clamp capacitor C3 shown in Figure 1, C3 ' links to each other with lead L3, the plus earth of C3, C3 ', and lead L3 polarity of voltage is for negative.
A kind of embodiment of switch switching device shifter is as shown in Figure 4, and every switch switching device shifter comprises two groups of combination switch SW1, SW1 ' and SW2, SW2 ' that adopt thyristor switch both sides parallel high-speed mechanical switch.SW1, SW1 ' conducting can be connected node 1 simultaneously with node 3, node 2 is connected with node 4, realize that promptly the positive pole of direct current clamp capacitor C3 shown in Figure 1, C3 ' links to each other the minus earth of C3, C3 ' with lead L3.SW2, SW2 ' conducting can be connected node 1 simultaneously with node 4, node 2 is connected with node 3, promptly realize the plus earth of direct current clamp capacitor C3 shown in Figure 1, C3 ', and the negative pole of C3, C3 ' links to each other with lead L3.
The transmission system organization plan 2 of employing mixing commutation technique raising provided by the invention alternating current circuit transmittability is as shown in Figure 5; This transmission system comprises three transmission pressure L1, L2, L3; Four voltage-source type converter VSC1, VSC1 ', VSC2, VSC2 '; The direct current clamp capacitor C1 of voltage source converter, C1 ', C2, C2 ', two as adopt current source converter (csc) CSC3, the CSC3 ' of bidirectional thyristor switch, and AC system 1, AC system 2.
The two ends of lead L1 link to each other with the positive pole of direct current clamp capacitor C1, C1 ', and the two ends of lead L2 link to each other with the negative pole of direct current clamp capacitor C2, C2 ', and the two ends of lead L3 link to each other with CSC3, CSC3 '.Common ground point is connected to the negative pole of C1, C1 ', the positive pole of C2, C2 ', the earth electrode of CSC3, CSC3 '.
Wherein the AC side of the current source converter (csc) CSC3 of head end and voltage source converter VSC1, VSC1 is passed through the same bus of converter transformer or reactor parallel connection incoming transport system 1 respectively, or different bus;
The AC side of wherein terminal current source converter (csc) CSC3 ' and voltage source converter VSC1 ', VSC2 ' is passed through the same bus of converter transformer or reactor parallel connection incoming transport system 2 respectively, or different bus.
It is following that the present invention adopts mixed type AC-DC commutation technique to improve the operation principle of transmission system of three-phase AC line transmittability:
Each polar conductor electric current of transmission system provided by the invention, change in voltage sketch map are as shown in Figure 6.Through the size of 3 electrode currents of periodically-varied, can under the identical condition of heat generation limit, increase the transmission power of direct current system.Through the polarity of periodically-varied the 3rd pole tension and electric current, realize that the periodicity of the 1st utmost point, the 2nd electrode current is shared.The cyclic variation between Imax and Imin of the size of the 1st utmost point, the 2nd electrode current, but direction is constant; The size of current of the 3rd utmost point constant (Imax-Imin), but direction cyclic variation.
The 1st utmost point, the 2nd utmost point, the 3rd utmost point heat generation limit are identical, and establishing its thermally-stabilised limiting current is IN=1.0pu.For making the 3rd utmost point reach its heat generation limit, then need satisfy formula 1.:
I
max-I
min＝I
N＝1.0pu ①；
The electric current of lead L1, L2 changes between maximum current Imax and minimum current I min, and the effective value of electric current in a cycle period will reach its heat generation limit equally, all reaches its thermally-stabilised limit with the heating that guarantees three leads.Specifically in Fig. 5, show as in 2 △ t times, the current effective value of lead L1, L2, L3 equates therefore need satisfy formula 2.:
1. 2. can be got with formula by formula, the running current Imax of lead L1, L2 is 1.37I
N, Imin is 0.37I
N
The variable power situation of lead L1, L2, L3 is as shown in Figure 7, and wherein the power of lead L1, L2 is between maximum power Pmax and minimum power Pmin, to change in the cycle with 2 △ t, and average power power is 0.87P
NLead L3 transmission power is kept P
NConstant, the overall transmission power of mixed type transmission system is 2.74P
N
The present invention proposes to adopt the transmission system of mixing commutation technique raising alternating current circuit transmittability; This structure adopts three leads and lead two ends to constitute three utmost point connection types based on the current source converter (csc) of half control type power electronic device with based on the voltage source converter of all-controlling power electronics devices such as IGBT, and each connects DC side extremely altogether.The present invention makes full use of the 3rd utmost point converter electric current two-way circulate voltage, the current polarity of ability periodic variation the 3rd polar conductor, is guaranteeing to realize that the periodicity of the 1st utmost point, the 2nd electrode current is shared under the constant prerequisite of 3 utmost point direct current power directions.Through suitable control, can make 3 polar conductor electric currents all reach its heat generation limit.Direct current flows between three leads in the structure according to the invention, does not constitute path with the earth, has avoided the corrosion of hardware in high-frequency electromagnetic interference and the earth.The present invention can improve the thermally-stabilised limit power of alternating current circuit more than 60%.Simultaneously, the present invention adopts mixed type AC-DC commutation technique, compares and adopts the voltage source converter cost to reduce fully, also possesses certain dynamic electric voltage enabling capabilities simultaneously, thus economy, flexibility and the reliability of the operation of raising system.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although the present invention has been carried out detailed explanation with reference to the foregoing description; Under the those of ordinary skill in field be to be understood that: still can specific embodiments of the invention make amendment or be equal to replacement; And do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. adopt and mix the transmission system that commutation technique improves the alternating current circuit transmittability, it is characterized in that said transmission system adopts three utmost point connection types, every utmost point wiring comprises the converter that lead and lead two ends connect respectively; Said converter comprises voltage source converter and current source converter (csc).
2. transmission system as claimed in claim 1 is characterized in that, said three leads adopt three-phase alternating current overhead transmission line or cable, corresponding to the 1st polar conductor, the 2nd polar conductor and the 3rd polar conductor of said transmission system.
3. transmission system as claimed in claim 1 is characterized in that, said transmission system comprises following two kinds of organization plans:
A kind of organization plan is following: wherein a utmost point wiring comprises the 1st polar conductor and current source converter (csc); Another utmost point wiring comprises the 2nd polar conductor and current source converter (csc); The 3rd utmost point wiring comprises the 3rd polar conductor, switch switching device shifter and voltage source converter;
Another kind of organization plan is following: wherein a utmost point wiring comprises the 1st polar conductor and voltage source converter; Another utmost point wiring comprises the 2nd polar conductor and voltage source converter; The 3rd utmost point wiring comprises the 3rd polar conductor and current source converter (csc).
4. transmission system as claimed in claim 3 is characterized in that, in said a kind of organization plan, a said utmost point wiring comprises the 1st polar conductor and current source converter (csc); Said the 1st polar conductor two ends are symmetrically arranged with current source converter (csc);
Another utmost point wiring comprises the 2nd polar conductor and current source converter (csc); Said the 2nd polar conductor two ends are symmetrically arranged with current source converter (csc); Said current source converter (csc) adopts unidirectional thyristor;
The 3rd utmost point wiring comprises the 3rd polar conductor, switch switching device shifter and voltage source converter; Said the 3rd polar conductor two ends are symmetrically arranged with switch switching device shifter and voltage source converter;
Said the 3rd polar conductor two ends are connected with the direct current clamp capacitor of voltage source converter is anodal respectively through the switch switching device shifter; Said direct current clamp capacitor minus earth; Or
Said the 3rd polar conductor two ends are connected with the direct current clamp capacitor negative pole of voltage source converter through the switch switching device shifter respectively; Said direct current clamp capacitor plus earth.
5. transmission system as claimed in claim 4; It is characterized in that the symmetrically arranged current source converter (csc) of said the 1st polar conductor and the symmetrically arranged current source converter (csc) in the 1st polar conductor two ends and the 2nd polar conductor and the 2nd polar conductor two ends constitutes bipolar high voltage direct current transmission connection type; Said the 1st polar conductor, the 2nd polar conductor and the common ground point of the 3rd polar conductor are connected.
6. transmission system as claimed in claim 4 is characterized in that said switch switching device shifter is used to realize the counter-rotating of the 3rd polar conductor polarity of voltage; It adopts mechanical switch, thyristor switch, based on the combination of switch or the mechanical switch and the thyristor switch of turn-off device.
7. transmission system as claimed in claim 3 is characterized in that, in the said another kind of organization plan, a said utmost point wiring comprises the 1st polar conductor and voltage source converter; Said the 1st polar conductor two ends are symmetrically arranged with voltage source converter; Said the 1st polar conductor two ends are connected with the direct current clamp capacitor of said voltage source converter is anodal respectively; Said direct current clamp capacitor minus earth;
Another utmost point wiring comprises the 2nd polar conductor and voltage source converter; Said the 2nd polar conductor two ends are symmetrically arranged with voltage source converter; Said the 2nd polar conductor two ends are connected with the direct current clamp capacitor negative pole of said voltage source converter respectively; Said direct current clamp capacitor plus earth;
The 3rd utmost point wiring comprises the 3rd polar conductor and current source converter (csc); Said the 3rd polar conductor two ends are symmetrically arranged with current source converter (csc).
8. transmission system as claimed in claim 7 is characterized in that, said current source converter (csc) is two-way antiparallel thyristor; Said the 1st polar conductor, the 2nd polar conductor and the earth point of the 3rd polar conductor are connected.
9. like each described transmission system among the claim 3-8, it is characterized in that said current source converter (csc) adopts the converter based on thyristor half control type electronic power switch device; Said voltage source converter adopts based on voltage-source type AC-DC that can turn-off power electronic device or DC-AC converter;
Wherein the AC side of the current source converter (csc) of head end and voltage source converter is passed through the same bus of converter transformer or reactor parallel connection incoming transport system respectively, or different bus;
The wherein terminal current source converter (csc) and the AC side of voltage source converter are passed through the same bus of converter transformer or reactor parallel connection incoming transport system respectively, or different bus.
10. transmission system as claimed in claim 9 is characterized in that, the voltage and current constant polarity of said the 1st polar conductor and the 2nd polar conductor, and said the 3rd polar conductor is realized the counter-rotating of polarity of voltage.
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